Still gets my adrenaline going. I remember when I was a young girl getting Aliens for Christmas (my dad let me watch Poltergeist when I was 11, this was the next step up).
I wasn't too keen on Alien at the time, seeing the John Hurt/chest bursting scene when I was so young might have been one reason but I think the truth is I wasn't too keen on the large amounts of suspense.
Aliens at the time I first saw it was the perfect film, suspense but with amazing action scenes that had you willing the marines and Ripley to get through it.
Maybe 14 years later and it still remains one of my favourites. The acting is superb, the effects stand the test of time and the story has me on the edge of the seat even though I must've seen it 30 times. Nothing like Aliens to give me panic attacks in the evening.
One of the best films ever, no exceptions.